The Obsidian Sync service can cause overwrites if I edit a file on one device before sync completes, on desktop it’s easy to wait for the the little sync icon to complete when first launching but AFAIK there’s no equivalent on iOS mobile/iPad.
Have an option to enable a “Sync completed” banner on mobile when sync completes.
Current workaround (optional)
Go to settings and view the sync activity and wait for the fully sync’d message.
There should be, if you have the Settings > Core Plugins > Sync turned on (I don’t have my old Android phone handy to check but it should the same as on iPhone). Swipe from the right edge of the screen to open the sidebar and it should be in the the upper right corner — a circle with a symbol inside. If you’re using a theme it’s possible the theme might have hidden or moved it, tho that would surprise me.